LMHP Linear Bearing UU Series — Square Flanged Sealed Ball Bushing

LMHP…UU flanged recirculating linear ball bearing series — ISO Square Flange. 9 bore sizes. Dynamic load 206–1570 N. GCr15 HRC 58–64, dual lip seals, flanged housing mount.

MOQ: 50 pcs. Minimum order value USD 1,500; mixed orders and trial quantities welcome.


Linear Bearings › Flanged Series › ISO Square Flange

LMHP Linear Bearing UU Series — Square Flanged Sealed Ball Bushing

9 bore sizes • Dynamic load 206–1570 N • ISO Square Flange

ISO Square Flange
GCr15 HRC 58–64
Flanged Mount
Dual Lip Seal

🆕 Series Overview

The LMHP...UU series is a square-flange linear ball bearing with four equally spaced bolt points at 90° intervals. Unlike round or diamond flanges, the square flange resists bearing rotation under torsional loads — the flat faces of the flange square against the housing walls to provide positive rotational location. This makes LMHP the preferred choice when a torque load component acts on the guided axis.

The LMHP flange face is ground flat and perpendicular to the bore axis, providing a clean sealing surface against the housing face that reduces contamination ingress pathways. The four bolt holes distribute clamping load evenly, and the flat outer faces of the flange can serve as datum references during assembly.

LMHP...UU flanged linear bearing product view

⚙ Key Design Features

📺

Flanged Axial Location

The precision-ground flange face registers directly against the housing shoulder, providing positive axial location without snap rings or adhesive retention.

●

GCr15 Chrome Steel

Through-hardened to HRC 58–64. Ball tracks ground to Ra 0.2 µm for full-film lubrication at the ball-race contact under rated load conditions.

📈

Dynamic Load 206–1570 N

Covering 9 bore sizes for applications from lightweight instrument stages to heavy industrial press guides.

🔒

NBR Dual Lip Seals

Retain factory-applied NLGI-2 grease while excluding dust and contamination. Rated −20°C to +80°C continuous service.

🛠

PA66-GF30 Retainer

Glass-filled nylon cage maintains precise ball spacing across the full 360° circuit, preventing ball-to-ball contact and associated noise.

✅

ISO/DIN Interchangeable

All dimensions conform to ISO Square Flange standards for direct replacement compatibility with equivalent housings.

📋 Complete Specification Table

ⓘ Dynamic load rating C based on 50 km nominal life (L10). For 100 km design life, divide C by 1.26. Shaft h6/h7. Housing H7. All dimensions in mm, load ratings in N, weight in g.

Model Bore dr OD D Length L H mm W mm A mm F mm Ball Cir. Dyn C (N) Sta Co (N) Wt (g)
LMHP6UU 6 12 19 19 18 5 20 4 206 265 21
LMHP8UU 8 15 24 21 21 5 24 4 274 392 33
LMHP10UU 10 19 29 25 25 6 29 4 372 549 64
LMHP12UU 12 21 30 27 27 6 32 4 510 784 68
LMHP13UU 13 23 32 29 29 6 33 4 510 784 81
LMHP16UU 16 28 37 34 34 6 38 5 774 1180 112
LMHP20UU 20 32 42 38 38 8 42 5 882 1370 167
LMHP25UU 25 40 59 46 46 8 51 6 980 1570 325
LMHP30UU 30 45 64 51 51 10 60 6 1570 2740 388
LMHP...UU dimensional specification drawing

🔭 Materials & Construction

GCr15 chrome-bearing steel (AISI 52100), HRC 58–64. The square flange is precision-machined and ground on all faces, with flange face squareness to bore axis within 0.02 mm across the series. PA66-GF30 nylon retainer. NBR dual lip seals −20°C to +80°C. Factory NLGI-2 grease fill.

The ball retainer is injection-moulded from glass-fibre-reinforced nylon (PA66-GF30), maintaining precise ball spacing around the full 360° circuit to prevent ball-to-ball contact noise at higher traverse speeds. Dual NBR lip seals on both end faces retain factory-applied NLGI-2 lithium-complex grease while excluding dust, swarf, and splash contamination. Operating temperature range is −20°C to +80°C with standard seals and grease.

🏭 Typical Applications

⚙

Medical Device Manufacturing

Square-flange (LMH/LMHP) bearings are preferred in syringe pump drives and diagnostic cartridge dispensers because the flat flange face seals cleanly against the housing wall, reducing contamination pathways in sterile manufacturing environments.

📈

Food & Beverage Processing

Flanged bearings in filling-nozzle platforms and portioning conveyors allow rapid cartridge replacement during product changeovers; the flange retains the bearing against the housing face without tools, reducing changeover time.

LMHP...UU linear bearing in industrial application

🔧 Installation & Maintenance

🔎 Flange Face Seating

Ensure the housing counterbore depth matches the bearing flange thickness. An under-depth counterbore leaves the flange proud of the housing face, creating a gap at the bolt interface that allows the bearing to rock under load and introduces harmonic error motion.

🔧 Bolt Torque Sequence

Tighten flange mounting bolts in a cross pattern to 30–50% of final torque, then complete to specification. Sequential tightening distorts the flange and shifts the bore axis by up to 0.05 mm, degrading shaft alignment.

📈 Housing Bore Tolerance

Machine the housing bore to H7 tolerance. For square-flange (LMH/LMHP) variants, also verify the flange seating face is square to the bore within 0.02 mm to prevent cocking the bearing on assembly.

⚙ Lubrication

Apply NLGI-2 lithium-complex grease to the shaft before insertion. Re-lubricate every 500 km of travel or 6 months under normal duty. In washdown environments, shorten the re-lubrication interval and use a water-resistant grease formulation.

🔎 Selection Guide

Select LMHP when torsional loads would cause a round or diamond flange to rotate in the housing. Verify the square flange envelope (dimension W) clears all adjacent housing features. The four bolt holes must align with the housing bolt pattern — LMHP is not rotationally adjustable after installation.

①

Confirm Bore & Standard

Match bore diameter to shaft. Confirm ISO Square Flange housing dimensions — mixing ISO and DIN outer diameters requires housing re-machining.

②

Select Flange Style

Round flange for maximum moment resistance; diamond flange for compact bolt clearance; square flange for torsional resistance.

③

Calculate Load & Life

Compute radial load P. Target L10 = (C/P)³ × 50 km. If life is marginal, specify the LUU extended variant to raise C without changing bore.

④

Contact Us

MOQ 100 units per model. Contact our team with engineering drawings confirming shaft diameter, housing bore depth, bolt PCD, load case, and target life.

LMHP...UU linear bearing assembly and housing

❓ Frequently Asked Questions

▶ What is the difference between LMF, LMK, and LMH flange styles?

LMF (round flange) has a circular flange with evenly spaced bolt holes — compact and easy to clock in any orientation. LMK (diamond/oval flange) has two bolt holes on opposite sides, reducing the radial footprint where adjacent components limit space. LMH (square flange) provides four bolt points at 90° intervals, giving the highest moment resistance and preventing bearing rotation under torsional loads.

▶ Can the LMF/LMK/LMH series replace standard LM...UU bearings in existing housings?

No. Flanged variants require a counterbored housing face to accept the flange. If your housing is machined for a plain LM...UU bearing without a counterbore, you must either re-machine the housing or use a flanged adapter plate. Outer diameter D is identical to the equivalent LM...UU, so the bore fit is unchanged.

▶ What bolt size should I use for the flange mounting holes?

Refer to the PCD and mounting-hole dimensions in the specification table for the selected bore size. Standard metric bolts (M3 to M10 depending on size) with spring washers are recommended. Use stainless fasteners in corrosive environments.

▶ Is the flange face perpendicular to the bore axis?

Yes. The flange face is ground perpendicular to the bore axis to a runout tolerance of 0.02 mm for bore sizes up to 30 mm and 0.03 mm for larger sizes. This ensures the shaft axis is perpendicular to the mounting face without additional shimming.

▶ What is the maximum axial load the flange can withstand?

The flange is designed to locate the bearing axially, not to carry sustained thrust loads. For intermittent axial retention (preventing bearing walk-out under reversal), the bolt preload through the flange is adequate. For sustained axial thrust, add a thrust washer or angular-contact element in series with the bearing.

📞 Ready to Order?

MOQ is 100 units per model. Provide engineering drawings with shaft diameter, housing bore depth, flange PCD, load case, stroke, speed, and target life. All catalogue data is for reference only — verify critical dimensions against current revision drawings before committing to tooling.

LMHP…UU flanged recirculating linear ball bearing series — ISO Square Flange. 9 bore sizes. Dynamic load 206–1570 N. GCr15 HRC 58–64, dual lip seals, flanged housing mount.

MOQ: 50 pcs. Minimum order value USD 1,500; mixed orders and trial quantities welcome.

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